Gilia yorkii - Shevok & Day
Boyden Cave Gily-flower
Taxonomic Status: Accepted
Unique Identifier: ELEMENT_GLOBAL.2.149363
Element Code: PDPLM04230
Informal Taxonomy: Plants, Vascular - Flowering Plants - Phlox Family
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Dicotyledoneae Solanales Polemoniaceae Gilia
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Concept Reference
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Concept Reference: Kartesz, J.T. 1999. A synonymized checklist and atlas with biological attributes for the vascular flora of the United States, Canada, and Greenland. First edition. In: Kartesz, J.T., and C.A. Meacham. Synthesis of the North American Flora, Version 1.0. North Carolina Botanical Garden, Chapel Hill, N.C.
Concept Reference Code: B99KAR01HQUS
Name Used in Concept Reference: Gilia yorkii
Conservation Status
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NatureServe Status

Global Status: G2
Global Status Last Reviewed: 10Aug2016
Global Status Last Changed: 10Aug2016
Ranking Methodology Used: Ranked by calculator
Rounded Global Status: G2 - Imperiled
Reasons: Gilia yorkii is endemic to California. It is only found near Boyden Cave, in the Kings River Canyon, in Fresno County. The number of individuals is not known, under optimum conditions there may be thousands of plants. Because of the rugged nature of its habitat, threats appear to be relatively low but non-native plants are a threat at all sites.
Nation: United States
National Status: N2

U.S. & Canada State/Province Status
Due to latency between updates made in state, provincial or other NatureServe Network databases and when they appear on NatureServe Explorer, for state or provincial information you may wish to contact the data steward in your jurisdiction to obtain the most current data. Please refer to our Distribution Data Sources to find contact information for your jurisdiction.
United States California (S2)

Other Statuses

NatureServe Global Conservation Status Factors

Range Extent Comments: Gilia yorkii is endemic to California and is only known from the southern Sierra Nevada in Fresno County. Specifically, it is known only from the vicinity of Boyden Cave in the Kings River Canyon (Shevock and Day 1998).

Area of Occupancy: 3-5 4-km2 grid cells
Area of Occupancy Comments:  

Number of Occurrences: 1 - 5
Number of Occurrences Comments: There are three documented occurrences (CNDDB 2016).

Population Size Comments: The number of Gilia yorkii individuals has not been estimated, and the population could number in the thousands under optimum environmental conditions (Shevock and Day 1998). Furthermore, Shevock and Day (1998) mention that G. yorkii can be overlooked in its habitat because its flowers blend in with the surrounding limestone outcrops in which it grows.

Number of Occurrences with Good Viability/Integrity: Very few (1-3)

Overall Threat Impact: Medium - low
Overall Threat Impact Comments: Competition from non-native plants is a threat at all occurrences (CNDDB 2016). Population is in a difficult to access location so threats appear to be low (J. Shevock, pers. comm., 2011).

Short-term Trend: Unknown

Long-term Trend: Unknown

Environmental Specificity: Narrow. Specialist or community with key requirements common.
Environmental Specificity Comments: The species is only known from limestone outcrops within a narrow elevational range of the southern Sierra Nevada of California.

Other NatureServe Conservation Status Information

Distribution
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Global Range: Gilia yorkii is endemic to California and is only known from the southern Sierra Nevada in Fresno County. Specifically, it is known only from the vicinity of Boyden Cave in the Kings River Canyon (Shevock and Day 1998).

U.S. States and Canadian Provinces

Due to latency between updates made in state, provincial or other NatureServe Network databases and when they appear on NatureServe Explorer, for state or provincial information you may wish to contact the data steward in your jurisdiction to obtain the most current data. Please refer to our Distribution Data Sources to find contact information for your jurisdiction.
Color legend for Distribution Map

U.S. & Canada State/Province Distribution
United States CA

Range Map
No map available.


U.S. Distribution by County Help
State County Name (FIPS Code)
CA Fresno (06019)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
18 Upper King (18030010)+
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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Basic Description: Short, annual herb in the phlox family that is endemic to Fresno County, California.
General Description: Gilia yorkii is an annual herb with a hairy, glandular stem up to 25 cm tall. The leaves are divided into smooth or toothed lobes, the largest leaves near the base of the plant measuring up to 2.5 cm long and the uppermost tiny and reduced. The inflorescence bears several flowers on threadlike, gland-studded pedicels. Each flower has a calyx of green sepals and white or pale blue or lavender tubular corolla just under a centimeter long. The pale color of the corolla helps the plant blend into the rocky surroundings, making it easy to miss.
Technical Description: From Porter (2011): Stem: branches more-or-less spreading, 10-25 cm, with long, soft, wavy hairs below, glandular puberulent above. Leaf: sparsely hairy; hairs translucent; lower leaves in non-persistent, suberect rosette, 1-2-pinnate-lobed, 1.5-2.5 cm, axis linear below, narrowly winged above, lobes distinct, lobes entire to toothed, teeth sharp-pointed; upper minute, entire to 2-toothed. Inflorescence: open; pedicels spreading, in unequal pairs or 3s, threadlike, glands colorless, flat-topped, short-stalked. Flower: calyx 3-3.6 mm, more-or-less glandular, lobes wider than membranes, green; corolla 7-8.5 mm, 1.5-3 calyx, white to pale lavender or blue, throat = tube, lobes ovate, obtuse; stamens reaching corolla throat top or more-or-less exserted, style exceeding anthers. Fruit: 3-4.5 mm, >= calyx, widely ovoid. Seed: (1)6-12. 2n=18.
Duration: ANNUAL
Terrestrial Habitat(s): Bare rock/talus/scree, Forest/Woodland, Shrubland/chaparral, Woodland - Mixed
Habitat Comments: Growing in fissures, on ledges and on terraces in sandy or gravelly soils on (weathered) limestone outcrops between 1290 and 1800 meters elevation (Shevock and Day 1998). Found in chaparral and cismontane woodland communities (CNPS 2011).
Economic Attributes Not yet assessed
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Management Summary
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Stewardship Overview: Document the extent of the one known occurrence. Identify and survey additional potential habitat. Confirm low level of threats.
Population/Occurrence Delineation Not yet assessed
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Population/Occurrence Viability
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U.S. Invasive Species Impact Rank (I-Rank) Not yet assessed
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Authors/Contributors
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NatureServe Conservation Status Factors Edition Date: 10Aug2016
NatureServe Conservation Status Factors Author: Oliver, L., rev. A. Tomaino (2011), rev. R. Bittman (2016)
Management Information Edition Date: 19Sep2011
Management Information Edition Author: Tomaino, A.

Botanical data developed by NatureServe and its network of natural heritage programs (see Local Programs), The North Carolina Botanical Garden, and other contributors and cooperators (see Sources).

References
Help
  • CalFlora. 2005. Information on California plants for education, research and conservation. Berkeley, California: The CalFlora Database [web application]. Available: http://www.calflora.org/. (Accessed 2005)

  • California Native Plant Society (CNPS). 2001. Inventory of Rare and Endangered Plants of California (sixth edition). Rare Plant Scientific Advisory Committee, David P. Tibor, Convening Editor. California Native Plant Society. Sacramento, CA. x + 388pp.

  • California Native Plant Society (CNPS). 2011. Inventory of Rare and Endangered Plants. California Native Plant Society. Sacramento, CA. Online. Available: http://www.cnps.org/inventory (accessed 2011).

  • California Natural Diversity Database (CNDDB). 2016. RareFind Version 5.1.1. California Department of Fish and Game, Sacramento.

  • Kartesz, J.T. 1999. A synonymized checklist and atlas with biological attributes for the vascular flora of the United States, Canada, and Greenland. First edition. In: Kartesz, J.T., and C.A. Meacham. Synthesis of the North American Flora, Version 1.0. North Carolina Botanical Garden, Chapel Hill, N.C.

  • Porter, J. M. 2011a. Gilia. In: B. G. Baldwin et al., editors. Jepson Manual II: Vascular Plants of California. University of California Press, Berkeley. [Retrieved on 28 April 2011.]

  • Shevock, J. and A. Day. 1998. A new Gilia (Polemiaceae) from limestone outcrops in the southern Sierra Nevada of California. Madrono 45(2): 137-140.

  • York, D. 2001. Discovering the endemic plants of Kings River Canyon. Fremontia 29(2): 3-6. [http://www.cnps.org/cnps/publications/fremontia/Fremontia_Vol29-No2.pdf]

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